Readfile

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It usefully discloses two behavioral traits: UTF-8 encoding assumption and a path-confinement boundary. However it omits failure modes (missing file, binary/non-UTF-8 content), size limits, and permission requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single sentence with zero filler; the scope constraint that matters most for correct invocation is included and nothing is padded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need no explanation. For a low-complexity single-parameter read tool, the description is nearly sufficient; only error/edge-case behavior for non-text or missing files is left uncovered.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

There is one parameter ('file') at 0% schema description coverage, so the description must compensate. It partially does by implying the value is a path resolved relative to the current directory, but it never states path syntax, whether absolute paths are rejected, or whether traversal is blocked.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Read and return a UTF-8 text file') plus a scope constraint ('beneath the current directory'). The read/return framing makes it distinguishable from writeFile, editFile, and listFiles, though no sibling is named explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the purpose but never stated: there is no guidance on when to prefer this over cmdshell or fetch, nor any mention of using listFiles to discover names first. The 'beneath the current directory' clause is the only implicit boundary condition.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.